<template>
  <div class="box">
    <el-dialog :class="'el-dialog-theme3'" :title="title" v-model="open" width="800px" append-to-body
      @opened="modalOpened" @close="closeDialog" draggable :close-on-click-modal="false">
      <el-row>
        <el-col :xs="24" :md="12" :style="{ height: '350px' }">
          <vue-cropper ref="cropper" :img="imageData.bytes" :info="true" :autoCrop="options.autoCrop"
            :autoCropWidth="options.autoCropWidth" :autoCropHeight="options.autoCropHeight" :fixedBox="options.fixedBox"
            :outputType="options.outputType" @realTime="realTime" v-if="visible" />
        </el-col>
        <el-col :xs="24" :md="12" :style="{ height: '350px' }">
          <div class="rectangle-upload-preview" style="'width: 219px; height:299px">
            <img :src="options.previews.url" :style="options.previews.img" />
          </div>
        </el-col>
      </el-row>
      <br />
      <el-row>
        <el-col :lg="2" :md="2">
          <el-upload action="#" :http-request="requestUpload" :show-file-list="false" :before-upload="beforeUpload">
            <el-button>
              选择
              <el-icon class="el-icon--right">
                <Upload />
              </el-icon>
            </el-button>
          </el-upload>
        </el-col>
        <el-col :lg="{ span: 1, offset: 2 }" :md="2">
          <el-button icon="Plus" @click="changeScale(1)"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :md="2">
          <el-button icon="Minus" @click="changeScale(-1)"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :md="2">
          <el-button icon="RefreshLeft" @click="rotateLeft()"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :md="2">
          <el-button icon="RefreshRight" @click="rotateRight()"></el-button>
        </el-col>
        <el-col :lg="{ span: 2, offset: 6 }" :md="2">
          <el-button type="success" @click="uploadImg">提 交</el-button>
        </el-col>
      </el-row>
    </el-dialog>
  </div>
</template>
    
<script setup>
import "vue-cropper/dist/index.css";
import { VueCropper } from "vue-cropper";
import { uploadImageAPI, showImageAPI } from "@/api/resource/instrumentItem"
import { ElMessage } from 'element-plus'


const { proxy } = getCurrentInstance();

const open = ref(false);
const visible = ref(false);
const title = ref("修改图片");

const imageData = ref({});
let $sourceComponent;
const emit = defineEmits(["showImage"]);
//图片裁剪数据
let options = reactive({
  // img: "", // 裁剪图片的地址
  autoCrop: true, // 是否默认生成截图框
  autoCropWidth: 219, // 默认生成截图框宽度
  autoCropHeight: 299, // 默认生成截图框高度
  fixedBox: true, // 固定截图框大小 不允许改变
  outputType: "png", // 默认生成截图为PNG格式
  previews: {} //预览数据
});


/** 编辑头像 */
function editCropper(groupId, fileType, fileId, bytes, $source) {
  imageData.value.type = fileType;
  open.value = true;
  if (fileId) {
    imageData.value.bytes = bytes;//模板中的byte流
    imageData.value.id = fileId//模板中的图片id
  }
  $sourceComponent = $source;
}

/** 打开弹出层结束时的回调 */
function modalOpened() {
  visible.value = true;
}

/** 覆盖默认上传行为 */
function requestUpload() { }

/** 向左旋转 */
function rotateLeft() {
  proxy.$refs.cropper.rotateLeft();
}

/** 向右旋转 */
function rotateRight() {
  proxy.$refs.cropper.rotateRight();
}

/** 图片缩放 */
function changeScale(num) {
  num = num || 1;
  proxy.$refs.cropper.changeScale(num);
}

/** 上传预处理 */
function beforeUpload(file) {
  if (file.type.indexOf("image/") == -1) {
    proxy.$modal.msgError("文件格式错误，请上传图片类型,如：JPG，PNG后缀的文件。");
  } else {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => {
      imageData.value.bytes = reader.result;
    };
  }
}

/** 上传图片 */
function uploadImg() {
  proxy.$refs.cropper.getCropBlob(data => {

    let formData = new FormData();
    formData.append("file", data);
    formData.append("groupId", imageData.value.groupId)
    formData.append("typeId", imageData.value.type)

    if (imageData.value.id) {
      formData.append("fileId", imageData.value.id)
    }
    uploadImageAPI(formData).then(response => {

      const blob = new Blob([data])
      let bytes = URL.createObjectURL(blob);
      //此处代码将选择的图片流回显到模板中对应的位置
      imageData.value.id = response.data.fileId;
      imageData.value.bytes = bytes;
      emit("showImage", imageData.value, $sourceComponent);
      ElMessage.success("上传成功");
      open.value = false;
    }).catch(err => {
      ElMessage.error("提交图片时出现错误：" + err)
    });
  })
}

/** 实时预览 */
function realTime(data) {
  options.previews = data;
}

/** 关闭窗口 */
function closeDialog() {
  imageData.value = {};
  options.previews = {};
  options.visible = false;
}

defineExpose({
  editCropper
});
</script>
    
<style lang='scss' scoped>
.user-info-head {
  position: relative;
  display: inline-block;
}

.user-info-head .cover::after {
  content: "+";
  display: inline-block;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  color: #999;
  font-size: 35px;
}

.user-info-head:hover:after {
  content: "+";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  color: #eee;
  background: rgba(0, 0, 0, 0.5);
  font-size: 35px;
  font-style: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  cursor: pointer;
}

.img-lg {
  height: 100%;
  border-radius: 3px !important;
  text-align: center;
}

.box {
  display: flex;
  justify-content: space-around;
}
</style>
